Apex domains cannot have CNAME records.
Question and response
Question
dig pepperweb.net. NS
Answer
pepperweb.net. 1 NS ns-848.awsdns-42.net.
pepperweb.net. 1 NS ns-1464.awsdns-55.org.
pepperweb.net. 1 NS ns-1576.awsdns-05.co.uk.
pepperweb.net. 1 NS ns-1652.awsdns-14.co.uk.
Authority
The response has no authority records.
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0